Roller coater chamfering device



Sept. 9, 1969 ALL'SON 3,465,641

ROLLER COATER CHAMFERING DEVICE Filed July 26. 1967 Lvvevrole. PHI LIP J. ALLISON ATTORNEYS United States Patent Office Patented Sept. 9, 1969 3,465,641 ROLLER COATER CHAMFERING DEVICE Philip J. Allison, Saint John West, New Brunswick, Canada, assignor to -T. S. Simms & Co. Limited, Saint John, New Brunswick, Canada Filed July 26, 1967, Ser. No. 656,092 Int. Cl. B23c 1/14, 3/02 US. CI. 90-11 1 Claim ABSTRACT OF THE DISCLOSURE This invention provides a mechanism for bevelling the ends of roller coater refills which essentially consists of a rotating cutter having one or more blades which pass between a pair of backing plates defining a V-shaped cavity so that a V-shaped groove may be cut in the outer periphery of a long length of roller coater core material. The core is subsequently cut at the V-shaped grooves so that the refills defined by the cutting action have bevelled ends.

This invention relates to the manufacture of roller coaters and is particularly concerned with a mechanism for bevelling the ends of roller coater refills.

The term roller coater refills as used herein means the short lengths of fabric covered tubing used on paint rollers. They are usually made by spirally winding and gluing a strip of pile fabric onto a long length of core tubing and subsequently cutting the latter into individual refills of from 3 to inches in length. In order to prevent the pile material from squashing out sidewise beyond the ends of the core when the coater is pressed against a surface, it is also common practice to chamfer the pile fabric at both ends of the refills. Heretofore, the chamfering of the pile fabric has been carried out after the long lengths of core material have been covered and cut into individual refills. There are, however, several disadvantages to this practice. For one thing, cutting prior to chamfering means that the cutting device must also cut through the pile fabric so that the life of the cutting means is unduly shortened. Secondly, cutting before chamfering often results in the cutting means damaging the coater by grabbing uncut fabric and tearing it away from the core.

It is, therefore, an object of this invention to provide a mechanism for chamfering the ends of roller coater refills which is adapted to complete the chamfering operation before the long lengths of covered core material are cut into individual refills.

It is a further and related object of the invention to provide a chamfering mechanism which is adapted to chamfer the adjacent ends of two roller coater refills simultaneously whereby to reduce the total chamfering time.

The above and further objects of the invention are gained by a chamfering mechanism which essentially consists of a rotatable cutter which is mounted to rotate against a pair of backing plates as to cause a shearing action between the blades of the cutter and the backing plates and which is adapted to operate on a long length ofcovered core material as to bevel the ends of adjacent roller coater refills prior to the cutting of the long length of core into the individual refills.

The invention will be more thoroughly understood from the following description of a preferred embodiment thereof as read in conjunction with the accompanying drawings.

In the drawings which illustrate this preferred embodiment of the invention,

FIG. 1 is a perspective view of the chamfering mechanism of the invention and shows a long length of fabric covered roller coater core material held against the mechanism for chamfering the ends of adjacent roller coater refills;

FIG. 2 is a front elevation view of a portion of the covered core material shown in FIG. 1 and illustrates the degree of bevel given the chamferred ends of the roller coated refills;

FIG. 3 is a side elevational view of the chamfering mechanism shown in FIG. 1; and

FIG. 4 is a cross-sectional view taken along the line 44 of FIG. 3.

Referring to FIG. 1, the illustrated chamfering mechanlsm essentially consists of a rotatable cutter 10 mounted for.rotation in a stand 12 which carries a pair of backing plates 14. The cutter is carried on a shaft. 16 having a pulley 18 at one end whereby the cutter may be rotated by means of a belt 20 which is connected at its other end to a motor. The cutter of the particular embodiment illus trated carries six cutting blades but it should be understood that it is within the scope of the invention to have more or less than six cutting blades 10a. The blades are formed of hardened steel or other metallic material capable of receiving and retaining cutting edges. In the particular form of the invention shown in the drawings, the angle at the forward point of the blades is as it is desired to provide a 45 bevel to the ends of the roller coater refills. However, Where more or less bevel is desired, the angle at the forward points of the blades would be appropriately adjusted. The bevelling mechanism is shown in FIG. 1 as operating on a length of roller coater material 22 which essentially consists of an inner hollow core 24 of fiberboard or the like which has been spirally wound with a strip of pile fabric material 26. These long lengths of covered core material might be any size and will produce varying numbers of individual roller coater refills depending upon the particular size of refills being produced at the time. Individual refills are normally from 3 to 10 inches in length.

The chamfering mechanism of the invention is intended to be held at a fixed position so that when it is desired to bevel a length of covered core material, the latter is taken from the winding machine and carried by an operator to the bevelling mechanism and slipped onto a retractable mandrel 27 until the end of the core contacts an adjustable stop 29 which has been preset according to the length of the refills being bevelled at the time. When the core length has been moved against the stop 29, the cutter 10 is set into operation and a bevel cut made. As the bevel is formed, a core cutter (not shown) is moved against the core from a point opposite the bevelling device and the core is severed. Finally, the operator causes the mandrel 27 to be retracted onto the adjustable stop and the freshly bevelled and severed refill drops downwardly. The mandrel is then again extended and the operation repeated until the long length of covered core has been formed into a number of refills, all of which are complete with bevelled ends.

As previously mentioned, the blades of cutter 10 are rotated between a pair of backing plates 14 which are illustrated in detail in FIGS. 3 and 4. These plates are also formed of hardened steel or the like and are capable of flexing to some degree as the cooperation between the blades and the backing plates is one which produces a shearing action and the slight flexibility in the backing plates helps to produce continuous contact and pressure along the cutting edges. As can best be seen in FIG. 4, the backing plates are adjustable by means of adjusting screws 28 which facilitates initial set-up and provides means to compensate for blade wear. The backing plates are actually two-piece items in the sense that strips 14:: of hardenable material are fixed along their upper edges.

Thus, both the requirements of flexibility and hardness can be incorporated in the backing plates. To obtain a proper shearing action, the angles X and Y, which are the shearing and relief angles respectively, are preferably in the order of Variations in these angles are possible, however, without departing from the scope of the invention and the size of these angles can vary with the type of pile fabric being chamferred with the degree of bevel and with the depth of bevel desired.

The cutter as described above has been defined as having more or less than the six blades shown in the drawings. In this regard, it will be appreciated that a single blade cutter, preferably counterbalanced, would be capable of carrying out the objects of the invention.

Further variations from the described embodiment of the invention are possible without departing from the scope of the invention. While the cutter 10 in the illustrated embodiment is fixed in position, the mechanism is equally adapted to be mounted for travel relative to a length of coater material held in a fixed position. In both cases, the mechanism is also adapted to move towards and away from the length of covered core material.

What I claim as my invention is:

1. A bevelling mechanism for bevelling the pile fabric at the ends of roller coater refills comprising a cutter mounted for rotation in a frame and having a plurality of radially outward extending pointed plate-like blades having cutting edges along the two side edges thereof, said frame also carrying a pair of flexible backing plates carrying hardenable metal strips fixed to their upper edges and defining a V-shaped cavity through which said cutting blades pass while the cutting edges thereof cooperate with said backing plates to effect a shearing type cutting action, said bevelling mechanism also including means adapted to connect said cutter to a motor whereby said cutter may be rotated as to repeatedly pass said blades through said cavity defined by the backing plates.

References Cited UNITED STATES PATENTS 1,567,920 12/1925 Cumfer 833S5 2,224,226 12/1940 Jensen -229 2,300,177 10/1942 Richmond 83-917 X 2,635,693 4/1953 Gibby 83592 X 3,228,274 1/1966 Cagen 83355 X ANDREW R. JUHASZ, Primary Examiner G. WEIDENFELD, Assistant Examiner US. Cl. X.R. 

